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PHYS1041 Notes Week 9

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Mount Allison University
PHYS 1041
Dr.David Fleming

Physics 1041 Notes April 2nd Human eye: • composed of lens, cornea, iris, and filled with aqueous humour and vitreous humour • shape of lens changes with focus; bends to focus near, flattens to focus far • lens hardens and bends less with age, becomes more difficult to see things that are near • the eye forms an inverted image, which is flipped to upright by the brain • signals are sent from the optic nerve to the brain when light signals are received in the retina by photoreceptors Corrective lenses: • near-sightedness: light focuses before the retina, and the person is unable to focus on far objects. Solution: a diverging lens to bring light backwards to the retina • far-sightedness: light focuses past the retina, and the person is unable to focus on near objects. Solution: a converging lens to bring light forward to the retina • the key parameter for lenses is the focal length • focal length is given as the inverse of the optical power, measured in Diopters, which are the inverse of a meter P = 1 f April 4th Human eye cont'd: • a blind spot exists in humans where the optic nerve joins the retina • there are no photoreceptors in this area • p
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